Well, here it is - the "source" for the BORG myth (John denies he ever asked after his golf clubs and no one has stepped forward to testify against him - - and now we get to hear the story started when...

Q. Page 48, the first full paragraph. "John was overheard to ask someone quietly, 'Did you get my
golf bag?'" Did I read that correctly?

A. Yes.

Q. Who overheard him ask that question?

A. I believe that was either John or Barbara Fernie.

Q. Who did they overhear him ask that question to? Who was the someone?

A. They could not identify that party.

Q. And when did that statement, was it allegedly made?

A. The did you get my golf bag statement?

Q. Yeah.

A. I think in the days following the murder.

Q. Do you know how many days after the murder?

A. No.

... some days after the murder someone (either John or Barbara, Thomas isn't sure) was not being spoken to but overheard a conversation to someone who they can't identify and they heard John asking after his golf clubs.

That sure doesn't sound like documented fact to me - not at all.